The Asset Price Theory of Shareholder Revaluations: Tests with the Tax Reforms of the 1980s

A tax reform providing incentives for fixed investment may increase shareholder wealth because after-tax cash flows on planned investment increase. Alternatively, shareholder wealth may decline because existing assets receive disadvantageous tax treatment relative to new ones and equities are largely claims on existing assets. This study tests the alternative hypothesis by predicting in a simulation model the revaluation of existing assets resulting from the 1981 and 1986 tax acts and then by comparing the predictions to stock returns data. The results reject the hypothesis that cumulative excess returns accruing because of tax reform equal the revaluation on existing assets.